JP2012221914A - Method for cutting laser transmission member, cutting device, and electrode manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cutting a laser transmission member which is capable of cutting even materials which cannot be usually cut by a laser and has excellent mass productivity, and to provide a cutting device and an electrode manufacturing method.SOLUTION: A method for cutting a laser transmission member provided in a laser cuttable member includes an irradiation step #101 of irradiating the laser cuttable member in a region in which the laser transmission member is provided with a laser and a cutting step #102 of separating two regions extending across a trajectory irradiated with the laser by the irradiation step #101 in applying a force to the regions.

Description

  The present invention relates to a laser transmitting member cutting method, a cutting apparatus, and an electrode manufacturing method.

  Patent Document 1 discloses a method of manufacturing an electrode for a lithium secondary battery by laser cutting a material.

JP 2002-289180 A

  The present inventors have also developed a technique for manufacturing a battery electrode by laser cutting a material. As the inventors proceeded with the development, it was found that some materials (materials to be cut) may not be cut well unless some device is used.

  The present invention has been made by paying attention to such conventional problems, and the object of the present invention is to allow laser transmission that is capable of being cut and is excellent in mass productivity even if the material is not normally laser-cut. It is providing the cutting method and cutting apparatus of a member, and an electrode manufacturing method.

  The present invention solves the above problems by the following means.

  The present invention is a method of cutting a laser transmitting member provided on a laser-cuttable member. And an irradiation step of irradiating the laser cleavable member in the region where the laser transmitting member is provided, and a cutting step of applying force to and separating the two regions spread across the locus irradiated with the laser in the irradiation step; , Including.

  According to the present invention, by applying a force to two areas spread across a laser-irradiated locus, both areas can be separated and cut, and even a material that cannot normally be laser-cut can be cut. It becomes possible and is excellent in mass productivity.

  Embodiments of the present invention and advantages of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a lithium ion secondary battery. FIG. 2 is a diagram for explaining an electrode manufacturing method excellent in mass productivity. FIG. 3 is a diagram showing a cut line for manufacturing an electrode from an electrode material sheet. FIG. 4 is a map showing recommended conditions for laser irradiation. FIG. 5 is a diagram showing an outline of a laser transmitting member cutting device. FIG. 6 is a detailed view of the laser head. FIG. 7 is a diagram for explaining the structure and operation of the cutting table. FIG. 8 is an operation timing chart of the laser and the cutting table. FIG. 9 is a diagram for explaining the operation of the movable part of the cutting table. FIG. 10 is a diagram for explaining a state of cutting along the cut line II.

  First, in order to facilitate understanding of the present invention, the technical idea of the inventors will be described.

  FIG. 1 is a diagram for explaining a lithium ion secondary battery, FIG. 1 (A) is a perspective view showing an appearance of a cell pack of a lithium ion secondary battery, and FIG. 1 (B) is a unit battery housed in the cell pack. FIG.

  Here, a lithium ion secondary battery will be described as an example of the battery.

  A cell pack 10 of a lithium ion secondary battery includes a unit battery 12 that is stacked in a predetermined number and electrically connected to an exterior material 11. The unit battery 12 will be described later with reference to FIG. Although not shown, a predetermined number of cell packs 10 of the lithium ion secondary battery are stacked and housed in a box (housing) made of aluminum or the like to form a lithium ion secondary battery package.

  The exterior material 11 accommodates the stacked unit batteries 12. Various materials for the exterior material 11 are conceivable. For example, there is a sheet material of a polymer-metal composite laminate film in which aluminum is covered with a polypropylene film. The exterior material 11 is heat-sealed on three sides so that one side is opened in a state in which the unit cells 12 are first stacked. Then, after the electrolytic solution is injected, the remaining one side is also heat-sealed. The packaging material 11 includes a positive electrode tab 111a and a negative electrode tab 111b for taking out the power of the unit battery 12 to the outside.

  One end of the positive electrode tab 111 a is connected to the positive electrode current collector inside the exterior material 11, and the other end goes out of the exterior material 11.

  One end of the negative electrode tab 111 b is connected to the negative electrode current collector inside the exterior material 11, and the other end goes out of the exterior material 11.

  As shown in FIG. 1B, the unit battery 12 includes a positive electrode 121a, a negative electrode 121b, and a separator 122.

  The separator 122 is an electrolyte layer that holds a fluid electrolyte (electrolytic solution). The separator 122 is a nonwoven fabric such as a polyamide nonwoven fabric, a polyethylene nonwoven fabric, a polypropylene nonwoven fabric, a polyimide nonwoven fabric, a polyester nonwoven fabric, or an aramid nonwoven fabric. The separator 122 may also be a microporous membrane film in which pores are formed by stretching the film. Such a film is used as a separator for an existing lithium ion battery. Further, polyethylene, polypropylene, polyimide film, or a laminate of these may be used. The thickness of the separator 122 is not particularly limited. However, the thinner the battery, the more compact the battery. Therefore, it is desirable that the separator 122 be as thin as possible within a range in which performance can be ensured. Generally, the thickness of the separator 122 is about 10 to 100 μm. However, the thickness may not be constant.

  The electrolyte (electrolytic solution) is, for example, a gel electrolyte in which about several to 99% by weight of an electrolytic solution is held in a polymer skeleton. A polymer gel electrolyte is particularly preferable. The polymer gel electrolyte includes, for example, a solid polymer electrolyte having ion conductivity and an electrolytic solution usually used in a lithium ion battery. Moreover, what hold | maintained the electrolyte solution normally used with a lithium ion battery in the polymeric frame | skeleton which does not have lithium ion conductivity may be used.

  The polymer gel electrolyte may be anything other than that made of 100% polymer electrolyte and may contain an electrolyte solution in the polymer skeleton. In particular, the ratio (mass ratio) between the electrolytic solution and the polymer is preferably about 20:80 to 98: 2. If it is such a ratio, the fluidity | liquidity by an electrolyte and the performance as an electrolyte will be compatible.

  The polymer skeleton may be either a thermosetting polymer or a thermoplastic polymer. Specifically, for example, a polymer having polyethylene oxide in the main chain or side chain (PEO), polyacrylonitrile (PAN), polymethacrylic acid ester, polyvinylidene fluoride (PVDF), a copolymer of polyvinylidene fluoride and hexafluoropropylene. Polymer (PVDF-HFP), polymethyl methacrylate (PMMA) and the like. However, it is not limited to these.

The electrolyte solution (electrolyte salt and plasticizer) contained in the polymer gel electrolyte is usually used in a lithium ion battery. For example, inorganic acid anion salts such as LiPF ₆ , LiBF ₄ , LiClO ₄ , LiAsF ₆ , LiTaF ₆ , LiAlCl ₄ , Li ₂ B ₁₀ Cl ₁₀ , LiCF ₃ SO ₃ , Li (CF ₃ SO ₂ ) ₂ N, Li Cyclic carbonates such as propylene carbonate and ethylene carbonate containing at least one lithium salt (electrolyte salt) selected from organic acid anion salts such as (C ₂ F ₅ SO ₂ ) ₂ N. Chain carbonates such as dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate may be used. Ethers such as tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, 1,2-dibutoxyethane may be used. Lactones such as γ-butyrolactone may be used. Nitriles such as acetonitrile may be used. Esters such as methyl propionate may be used. Amides such as dimethylformamide may be used. An organic solvent (plasticizer) such as an aprotic solvent in which at least one selected from methyl acetate and methyl formate is mixed may be used. However, it is not limited to these.

  The positive electrode 121a includes a positive electrode current collector foil and positive electrode active material layers formed on both surfaces thereof. The positive electrode 121a is disposed on one surface of the separator 122 (the lower surface of the separator 122 in FIG. 1B).

  The positive electrode current collector foil is a foil made of, for example, aluminum, copper, titanium, nickel, stainless steel (SUS), or an alloy thereof. The thickness of the positive electrode current collector foil is not particularly limited, but is usually about 1 to 100 μm.

The positive electrode active material of the positive electrode active material layer is particularly preferably a lithium-transition metal composite oxide. Specifically, for example, a Li · Mn composite oxide such as spinel LiMn ₂ O _4, a Li · Co composite oxide such as LiCoO ₂ , a Li · Ni composite oxide such as LiNiO ₂ , LiFeO _2, etc. Li / Fe-based composite oxide. Alternatively, a transition metal such as LiFePO ₄ and a lithium phosphate compound or a sulfate compound may be used. Furthermore, transition metal oxides and sulfides such as V ₂ O ₅ , MnO ₂ , TiS ₂ , MoS ₂ , and MoO ₃ may be used. Further, PbO ₂ , AgO, NiOOH or the like may be used. Such a positive electrode active material can constitute a battery having excellent battery capacity and output characteristics.

  The particle size of the positive electrode active material may be such that the positive electrode material can be made into a paste and formed by spray coating or the like, but a smaller one can reduce the electrode resistance. Specifically, the average particle diameter of the positive electrode active material is preferably 0.1 to 10 μm.

  In addition to this, the positive electrode active material may contain an electrolyte, a lithium salt, a conductive auxiliary agent, and the like in order to enhance ion conductivity. Examples of the conductive assistant include acetylene black, carbon black, and graphite.

  The compounding amount of the positive electrode active material, the electrolyte (preferably a solid polymer electrolyte), the lithium salt, and the conductive auxiliary agent is set in consideration of the intended use of the battery (emphasis on output, energy, etc.) and ion conductivity. For example, if the amount of the electrolyte, particularly the solid polymer electrolyte, is too small, the ionic conduction resistance and the ionic diffusion resistance in the active material layer become large, and the battery performance deteriorates. On the other hand, when the amount of the electrolyte, particularly the solid polymer electrolyte is excessive, the energy density of the battery is lowered. Therefore, taking these into consideration, a specific blending amount is set. The thickness of the positive electrode active material layer is not particularly limited. The battery is set in consideration of the purpose of use of the battery (emphasis on output, energy, etc.) and ion conductivity. A typical positive electrode has a thickness of about 1 to 500 μm.

  The negative electrode 121b includes a negative electrode current collector foil and negative electrode active material layers formed on both surfaces thereof. The negative electrode 121b is disposed on the other surface of the separator 122 (the upper surface of the separator 122 in FIG. 1B).

  The negative electrode current collector foil may be the same as the positive electrode current collector foil or a different one.

  Specifically, the negative electrode active material of the negative electrode active material layer is a metal oxide, a lithium-metal composite oxide metal, carbon, titanium oxide, a lithium-titanium composite oxide, or the like. In particular, carbon, transition metal oxide, and lithium-transition metal composite oxide are preferable. Among these, carbon or lithium-transition metal composite oxide can increase the battery capacity and output of the battery. These may be used alone or in combination of two or more.

  A predetermined number of such unit cells 12 are stacked, and each positive electrode current collector foil is assembled into one and electrically connected in parallel. This aggregated portion is a positive electrode current collector, and a positive electrode tab 111a is connected to the positive electrode current collector. Further, the negative electrode current collector foils are gathered together and electrically connected in parallel. This gathering portion is a negative electrode current collector, and the negative electrode tab 111b is connected to the negative electrode current collector.

  The positive electrode 121a and the negative electrode 121b are arranged so as to sandwich the separator 122, but if the positions are shifted, the positive electrode 121a and the negative electrode 121b may be short-circuited. In particular, the present inventors have found that there is a possibility of short-circuiting at a portion A surrounded by a dashed-dotted circle in FIG. 1B where the positive electrode 121a and the negative electrode 121b intersect. Therefore, the inventors of the present invention have conceived that an insulating adhesive tape is applied to a region including A part of at least one of the positive electrode 121a and the negative electrode 121b. Since this insulating adhesive tape prevents short circuit between the positive electrode 121a and the negative electrode 121b, it may be attached to either one or both. Moreover, in the following description, it demonstrates as an electrode, without specifying to a positive electrode / negative electrode.

  FIG. 2 is a diagram for explaining an electrode manufacturing method excellent in mass productivity.

  While considering various concrete methods, the present inventors cut the laser by irradiating a laser with the insulating adhesive tape 1213 attached to the electrode material sheet 1210 in consideration of mass productivity. This led to a method for manufacturing an electrode. The electrode material sheet 1210 has an electrode active material layer 1212 formed in a predetermined region of the electrode current collector foil 1211. The insulating adhesive tape 1213 is a resin tape such as polypropylene (PP).

  A state in which the resin tape 1213 is attached to the electrode material sheet 1210 is shown in FIG. As can be seen from FIG. 2B, an electrode active material layer 1212 is formed in a predetermined region of the electrode current collector foil 1211. The resin tape 1213 is stuck across the electrode active material layer 1212 formed on the electrode current collector foil 1211 and the electrode current collector foil 1211 on which the electrode active material layer 1212 is not formed.

  FIG. 3 is a diagram showing a cut line for manufacturing an electrode from an electrode material sheet.

  As described above, in consideration of mass productivity, the present inventors have come up with a technique for manufacturing an electrode by cutting by irradiating a laser with the resin tape 1213 attached to the electrode material sheet 1210. The electrode material sheet 1210 to which the resin tape 1213 is affixed is cut along a cut line indicated by a dashed line. In this way, the desired electrode 121 can be manufactured by a method excellent in mass productivity.

  However, since the resin tape 1213 transmits the laser, the present inventors have found that the resin tape 1213 cannot be cut well unless some device is used.

  That is, since the resin tape 1213 existing on the cut line I and the cut line II in FIG. 3 transmits the laser, it cannot be cut unless some device is used. Note that the resin tape 1213 is not attached to the cut line III, and the electrode current collector foil 1211 is exposed. Therefore, this can be laser-cut by the usual method.

  Therefore, the inventors repeated various experiments, and for cut line I, the component contained in the electrode active material by irradiating the electrode active material layer 1212 with the resin tape 1213 attached thereto with a laser having a predetermined power density. It was found that the resin tape 1213 was cut by the heat and pressure of the evaporated gas. On the other hand, for the cut line II, as shown in FIG. 3B, the resin tape 1213 is attached to the electrode current collector foil 1211 instead of the electrode active material layer 1212. Therefore, since the evaporation phenomenon of the electrode active material layer does not occur, the resin tape 1213 is not cut. However, it has been found that the resin tape 1213 melts in some places due to the heat of the electrode current collector foil 1211 when laser cutting is performed, and the strength decreases. In this state, the resin tape 1213 in the cut line II can be cut by holding the electrode 121 and the surplus member 125 sandwiching the cut line (laser irradiation locus) and pulling them apart. However, if the heat input from the laser is too small, the strength of the resin tape 1213 will not be weakened. If the amount of heat input from the laser is too large, the electrode current collector foil 1211 is excessively cut. As a result, a recommended condition map as shown in FIG. 4 was obtained. If this FIG. 4 is used, the output and cutting speed of a laser can be calculated | required from the intensity | strength which can pull apart the electrode 121 and the surplus member 125 which pinched | interposed the cut line (laser irradiation locus | trajectory). The cut line I is irradiated with a laser smaller than the predetermined power density, so that the resin tape 1213 melts in some places and the strength is weakened, but the cut line I is not cut. In this state, the resin tape 1213 in the cut line I can be cut by holding the electrode 121 and the surplus member 125 sandwiching the cut line (laser irradiation locus) and pulling them apart.

  Below, the laser transmissive member cutting device which embodies such a technical idea will be described.

  FIG. 5 is a diagram showing an outline of a laser transmitting member cutting device.

  The laser transmitting member cutting device 20 includes a laser oscillating unit 21, a laser head 22, a laser head positioning unit 23, and a work carrier 24.

  The laser oscillation unit 21 generates a laser. The laser is, for example, a laser having a wavelength of 1 μm band. With such a laser, chips generated when the electrode material sheet 1210 is cut can be reduced. Therefore, it becomes difficult for chips to remain inside the battery. Moreover, it can cut at high speed. Therefore, it is excellent in mass productivity. As a laser having a wavelength of 1 μm, there are a YAG laser and a fiber laser. More specifically, there is a single mode fiber laser having a wavelength of 1.07 μm.

  The laser head 22 is connected to the laser oscillation unit 21 via a fiber cable 261. The laser head 22 emits a laser. The laser head 22 is connected to the gas supply unit 25 via the gas tube 262. An electromagnetic valve 263 is provided in the middle of the gas tube 262, and the supply or stop of gas can be switched. Other details of the laser head 22 will be described later.

  The laser head positioning unit 23 supports the laser head 22 and moves the laser head 22 in the front-rear direction (X direction) and the left-right direction (Y direction).

  The workpiece conveyance table 24 conveys the electrode material sheet 1210 to a predetermined position, and holds the electrode material sheet 1210 so that the position is not shifted during laser cutting. Specifically, the work conveyance table 24 includes a sheet conveyance conveyor 241, a cutting table 242, and an electrode conveyance conveyor 243.

  The sheet transport conveyor 241 is a belt conveyor that places and transports the electrode material sheet 1210.

  The cutting table 242 sucks and holds the electrode material sheet 1210 conveyed by the sheet conveying conveyor 241 so that the position is not displaced. In this state, the laser head 22 irradiates the electrode material sheet 1210 with laser. Note that the cutting table 242 includes a fixed portion 2421 and a movable portion 2422. Both the fixed portion 2421 and the movable portion 2422 are provided with air suction ports. The operation of the movable portion 2422 will be described later.

  The electrode conveyor 243 is a belt conveyor that places and conveys the electrode 121 cut out from the electrode material sheet 1210 on the cutting table 242.

  FIG. 6 is a detailed view of the laser head.

  The laser head 22 includes a fiber connector at the end 221. A fiber cable 261 is connected to the fiber connector. The laser head 22 takes in the laser from the fiber connector. The laser head 22 has a tip 222 as a nozzle tip. For example, the tip diameter of the nozzle tip is φ0.8 to 1.5 mm. The laser head 22 irradiates the laser from the nozzle tip. The laser head 22 includes a gas intake part 223. A gas tube 262 is connected to the gas intake portion 223. The laser head 22 takes in the gas supplied from the gas supply unit 25 from the gas intake port 223. This gas is jetted coaxially with the laser from the tip of the nozzle tip. Further, the laser head 22 includes a camera 224. This camera 224 is for confirming the position of the tip of the nozzle tip.

  FIG. 7 is a diagram for explaining the structure and operation of the cutting table.

  As described above, the cutting table 242 includes the fixed portion 2421 and the movable portion 2422.

  The fixed portion 2421 is provided with an air suction port 2421 a along the outer shape of the electrode 121 cut out from the electrode material sheet 1210.

  The movable portion 2422 is provided with an air suction port 2422a in a region where the surplus member 125 to be removed from the electrode material sheet 1210 is placed. The movable portion 2422 descends from the horizontal state around the pivot 2422b whose axial direction is the X-axis direction (front-rear direction).

  FIG. 8 is an operation timing chart of the laser and the cutting table.

  Note that this timing chart only explains the order of operation of each part, and does not indicate a certain time even at a certain interval on the horizontal axis.

  Until the timing t1, the laser is stopped. Further, the fixing portion 2421 stops air suction. The movable portion 2422 is in a lowered state while stopping air suction. In this state, the sheet conveying conveyor 241 conveys the electrode material sheet 1210. Since the movable portion 2422 is in the lowered state, the electrode material sheet 1210 can be easily conveyed.

  When the timing t1 when the electrode material sheet 1210 reaches a predetermined position, the fixed portion 2421 and the movable portion 2422 start air suction. Then, at timing t2, the movable portion 2422 is brought into a horizontal state. Thus, the electrode material sheet 1210 is held so as not to be misaligned.

  When the timing t3 comes, laser irradiation is started. In addition, from the timing t3 to the timing t4 shows the laser irradiation along the cut line I. From timing t4 to timing t5 indicates laser irradiation along the cut line II. From time t5 to time t6 indicates laser irradiation along the cut line III. This process is an irradiation process # 101 and is shown in FIGS. 9A-1 and 9A-2.

  At timing t7, the fixing portion 2421 stops air suction.

  At timing t8, the movable part 2422 is lowered. As a result, the excess member 125 is shredded from the electrode material sheet 1210. This process is a cutting process # 102 and is shown in FIGS. 9 (B-1) and 9 (B-2).

  At timing t9, the movable part 2422 stops air suction. As a result, the surplus member 125 is separated from the movable portion 2422 and discarded downward. This process is the discarding process # 103 and is shown in FIGS. 9 (C-1) and (C-2).

  FIG. 10 is a diagram for explaining a state of cutting along the cut line II. The upper side is a plan view and the lower side is a longitudinal sectional view.

  As shown in FIG. 10A, when the electrode material sheet 1210 is irradiated with the laser L along the cut line II, the laser passes through the resin tape 1213 and is absorbed by the electrode current collector foil 1211.

  Then, as shown in FIG. 10B, the electrode current collector foil 1211 is cut. At this time, although the resin tape 1213 rises in temperature due to the heat of the electrode current collector foil 1211 and is partially cut, the resin tape 1213 is broken in a crosslinked state.

  However, since the strength is reduced, as shown in FIG. 10 (C), when the surplus member 125 is pulled away, the surplus member 125 is cut as shown in FIG. 10 (D). When the cutting is completed, the resin tape 1213 contracts and returns to the original state, so that the cut surface does not become excessively dirty.

  Resin tape that penetrates the laser cannot be laser cut. In this embodiment, the electrode material sheet 1210 to which the resin tape is affixed is irradiated with a laser. Then, the resin tape 1213 receives the heat of the electrode material sheet 1210 and rises in temperature. However, if the amount of generated heat is small, the resin tape 1213 is partially cut, but uncut portions are generated in a crosslinked state. In particular, in a metal foil such as the electrode current collector foil 1211 of the electrode material sheet 1210, the amount of heat generated is small because the degree of laser absorption is small. Therefore, the resin tape 1213 affixed there is not easily cut. Therefore, in the present embodiment, the electrode 121 and the surplus member 125 sandwiching the cut line (laser irradiation locus) are held in a state of being left in a cross-linked state, and both are separated. By doing so, the resin tape 1213 can be cut. As described above, according to the present embodiment, even a resin tape that passes through a laser and cannot be cut by a laser can be cut. And since a resin tape can be used, it is excellent in mass productivity.

  In addition, the component contained in an electrode active material evaporates by irradiating the electrode active material layer 1212 with the resin tape 1213 affixed with a laser having a predetermined power density, and the resin tape 1213 is caused by the heat or pressure of the evaporated gas. Although it is cut, when it is irradiated with a laser smaller than that, the resin tape 1213 melts in some places and the strength is weakened, but it is not cut. In this state, the resin tape 1213 can be cut also by holding the electrode 121 and the surplus member 125 sandwiching the cut line (laser irradiation locus) and pulling them apart.

  In addition, after the electrode material sheet 1210 is irradiated with laser, the electrode material sheet 1210 is cut off without being moved, so that it is possible to prevent the process from being unnecessarily lengthened. In addition, when transported immediately after laser irradiation, there is a risk that the uncut portion will be caught by the peripheral equipment, resulting in transport abnormalities. However, according to the present embodiment, such abnormalities do not occur. Thus, it is possible to avoid line redundancy and conveyance abnormality, and to reduce the equipment cost.

  Furthermore, since unnecessary redundant members are discarded without moving the electrode material sheet 1210 after being pulled, it is not necessary to install a separate disposal mechanism, so that the equipment cost can be reduced and the line tact time can be reduced. Can be improved.

  Furthermore, although the electrode material sheet 1210 is held by air suction, such equipment can use other equipment and does not increase equipment costs.

  Further, when the surplus member 125 is pulled away, it can be reliably cut by rotating or sliding.

  Furthermore, according to the present embodiment, it is not necessary to use a special material for the resin tape, and since a general-purpose one that is also used for a laser can be used, the direct material cost may increase due to the member change, It can avoid that cutting quality deteriorates and processing time increases.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, in the above description, the movable part 2422 of the cutting table is rotated and lowered from the horizontal state around the pivot 2422b whose axial direction is the X-axis direction (front-rear direction). Good. The pivot axial direction may be the Y-axis direction (left-right direction) or the Z-axis direction (vertical direction). Further, the movable part 2422 of the cutting table may slide (translate) back and forth, left and right, or up and down.

  In the above description, the fixed part 2421 and the movable part 2422 of the cutting table are sucked and held by the electrode material sheet 1210, but may be held by gripping.

  Furthermore, in the above description, the resin tape 1213 is affixed to both the upper and lower surfaces of the electrode material sheet 1210, but may be affixed to any one surface.

DESCRIPTION OF SYMBOLS 10 Cell pack of lithium ion secondary battery 11 Exterior material 12 Unit battery 121 Electrode (121a positive electrode, 121b negative electrode)
1210 Electrode material sheet 1210
1211 Electrode current collector foil 1212 Electrode active material layer 1213 Insulating adhesive tape (resin tape; resin member)
122 Separator 125 Surplus Member 20 Laser Transmitting Member Cutting Device 21 Laser Oscillating Unit 22 Laser Head 23 Laser Head Positioning Unit 24 Work Conveying Table 241 Sheet Conveying Conveyor 242 Cutting Table 2421 Fixed Unit 2422 Movable Unit 243 Electrode Conveying Conveyor # 101 Irradiation Step # 102 Cutting process # 103 Disposal process

Claims (8)

A method of cutting a laser transmitting member provided on a laser-cuttable member,
An irradiation step of irradiating a laser to the laser-cuttable member in the region provided with the laser transmitting member;
A cutting step in which force is applied to two regions that spread across the locus irradiated with laser in the irradiation step; and
A laser transmitting member cutting method including: In the laser transmissive member cutting method according to claim 1,
The laser transmitting member is a resin member,
In the cutting step, after the laser is irradiated in the irradiation step, the two regions are held and separated by applying force,
Laser transmitting member cutting method. In the laser transmissive member cutting method according to claim 2,
After cutting in the cutting step, further includes a discarding step of discarding the unnecessary area by stopping the holding of one unnecessary area of the two areas.
Laser transmitting member cutting method. In the laser transmissive member cutting method according to any one of claims 1 to 3,
The cutting step is performed by rotating or sliding the two regions while holding the two regions.
Laser transmitting member cutting method. A method for producing an electrode from an electrode material sheet on which a laser transmitting member is formed,
An irradiation step of irradiating the electrode material sheet in a region where the laser transmitting member is formed;
A cutting step in which force is applied to two regions that spread across the locus irradiated with laser in the irradiation step; and
An electrode manufacturing method comprising: In the electrode manufacturing method according to claim 5,
The electrode material sheet has an electrode active material layer formed in a predetermined region of the electrode current collector foil,
The laser transmitting member is an insulating adhesive tape, and is attached to an electrode current collector foil on which the electrode active material layer is not formed,
The laser is a laser having a wavelength of 1 μm,
Electrode manufacturing method. In the electrode manufacturing method according to claim 5,
The electrode material sheet has an electrode active material layer formed in a predetermined region of the electrode current collector foil,
The laser transmitting member is an insulating adhesive tape, and is attached to an electrode active material layer formed on the electrode current collector foil,
The laser is a laser having a wavelength of 1 μm,
Electrode manufacturing method. An apparatus for cutting a laser transmitting member provided on a laser-cuttable member,
An irradiation unit that irradiates a laser to a laser-cuttable member in a region where the laser transmitting member is provided
A cutting section that applies force to and separates two areas that spread across the locus irradiated with the laser;
A laser transmitting member cutting device comprising:

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